The Krix Cyclonix 18 is a large passive subwoofer designed for dedicated home cinemas and high-performance media rooms. It reproduces the deep bass used for explosions, impacts, engines, music and other low-frequency effects.

The Cyclonix 18 is a passive subwoofer. It does not contain a built-in amplifier, signal processor or mains power supply. A separate power amplifier is required.

The LFE or subwoofer output from the AV processor or receiver connects to a suitable power amplifier. Speaker cable then carries the amplified signal from the power amplifier to the Cyclonix 18.

Not directly. The subwoofer output on an AV receiver is a low-level signal and cannot drive the Cyclonix 18 by itself. It must feed a separate power amplifier that is suitable for an 8 Ohm passive subwoofer.

Krix recommends an amplifier power range of 200 to 1400 Watts RMS. The correct amplifier depends on the room, listening distance, required output, number of subwoofers and the protection available in the amplifier or signal processor.

A high-pass filter reduces very low signals below the subwoofer’s intended operating range. A soft limiter controls excessive power before it can force the driver beyond its safe operating limits. These functions help protect the subwoofer during demanding cinema effects.

Krix recommends a 20 Hz high-pass filter with a 24 dB per octave Butterworth response and a limiter set for 1000 Watts into 8 Ohms. These settings should be configured by the system designer or installer so they operate correctly with the amplifier’s gain and signal level.

The specified frequency range is 25 Hz to 200 Hz as an in-room response. The final response will also be affected by the room, subwoofer position, seating position and system processing.

Not necessarily. The upper crossover frequency should be selected to match the main loudspeakers and the cinema design. The 200 Hz figure describes the subwoofer’s available operating range, not the crossover setting required for every installation.

A 25 Hz response reaches into the deep bass region where powerful cinema effects may be heard and felt. The exact result at each seat will depend on the room dimensions, construction, placement and acoustic behaviour.

The Cyclonix 18 uses a single 455 mm, or 18-inch, paper-cone bass driver. Its large cone can move a substantial volume of air, which is necessary for producing high-output low-frequency effects.

The 100 mm, or 4-inch, edge-wound copper voice coil is designed to handle substantial electrical power. Its large surface area also helps transfer heat away from the coil during demanding passages.

The spiders are suspension components that help keep the voice coil centred while the cone moves forward and backward. Using two spiders provides additional control and stability when the driver is moving over a large distance.

The sensitivity is specified as 100 dB SPL with 2.83 volts measured at one metre. This indicates that the Cyclonix 18 can produce substantial output from a relatively small input. It is a reference measurement and does not represent the subwoofer’s maximum output.

The Cyclonix 18 has a nominal impedance of 8 Ohms. The selected power amplifier must be able to operate safely into this load while supplying the required output power.

A bass-reflex enclosure uses tuned vents to support the driver’s low-frequency output. The Cyclonix 18 vents face forward, allowing the bass driver and ports to direct their acoustic output from the same side of the enclosure.

The two vents provide the air path required by the tuned enclosure. They support the subwoofer’s output at low frequencies and help manage airflow when the driver is operating at high levels. Both vents must remain clear.

The driver is installed in a high-quality MDF enclosure using the proprietary Krix X-brace system. The internal bracing strengthens the cabinet and reduces unwanted panel movement that could otherwise add noise to the bass output.

The large voice coil and vented magnet assembly help heat escape from the driver. Better heat transfer reduces thermal power compression, which occurs when a hot voice coil becomes less efficient during long periods of high output.

The best position depends on the room dimensions, seating layout and acoustic design. A front corner may increase output, but it is not automatically the best position for every room. Subwoofer locations should be considered during the cinema design.

Yes. Its front-facing driver and vents make the Cyclonix 18 suitable for installation behind an acoustically transparent cinema screen. The driver and vents must not be blocked by framing, acoustic treatment or other equipment.

It may be integrated into a properly designed structure with a fully open front. The cabinet must support the subwoofer’s weight, provide a clear path for the driver and vents, and avoid loose panels or fittings that could rattle.

One Cyclonix 18 may provide the required output in some rooms. Larger rooms, several seating positions or higher performance targets may benefit from two or more subwoofers. The correct quantity should be determined from the complete cinema design.

Multiple subwoofers can provide additional output and distribute the workload between several drivers. Correct placement can also reduce large differences in bass response between seats. The subwoofers must be positioned, connected and commissioned as one system.

There is no single room-size limit. Suitability depends on room volume, listening distance, construction, openings into other spaces, seating positions and the required playback level. These factors also determine how many subwoofers are needed.

The Cyclonix 18 uses high-current spring terminals with a 5 mm cable opening. The terminals accept cable sizes up to 10 AWG. Cable size should be selected according to its length, amplifier power and installation method, with correct polarity maintained throughout.

The enclosure measures 1215 mm high, 750 mm wide and 310 mm deep. Its depth increases to 330 mm when the optional grille is installed. Additional space may be required for cabling and safe installation.

Each Cyclonix 18 weighs 64 kg. The supporting floor, platform or structure must carry this weight safely. Suitable lifting assistance should be used when moving or positioning the subwoofer.

The proprietary Krix rubber feet are provided free of charge

A grille is available as an option and increases the total depth to 330 mm.